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    				| 1. | 2 balls have masses of 50 gm and 100 gm respectively and they are moving along the same line in the same direction with velocities of 3 m/s and 1.5 m/s respectively.They collide with each other and after the collision, the first ball moves with a velocity of2.5 m/s. Calculate the velocity of the other ball after collision. | 
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